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When a burning stick of incense is moved...

When a burning stick of incense is moved fast in a circle, a circle of rod light is seen. Why does this happen? Explain.

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The impression of the image on the retina lasts for about `1/(16)` th of a second after the removal of the object. If a burning stick of incense is moved at a rate of more than sixteen revolutions per second, we can a circle of red light due to persistance of vision.
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